Method of lining tubes



G. A. SMALL METHOD OF LINING TUBES Filed May l5, 1924 IN'VEN TOR A TTORNEYS `lune 18, 1929.

Patented June 18, 1929.

UNITED STATES 1,711,583 PATENT oEEIcE.

GEoneE A. SHALL, or PHILADELPHIA, PENNSYLVANIA, AssIGNoa '.ro PHILADELPHIA BRONZE :BEARING AND TUBE COMPANY, A conPoBATIoN or'v PENNSYLVANIA.-

METHOD F LINING TUBES.

Application filed Hay 13,

My invention relates to tube lining apparatus and methods and is more especially concerned with forming the 'liningx from sheet metal directly in the tube W ich is to be lined.

The invention is particularly useful for the production of steel jacketed bronze lined bearings or bearing sleeves.

One of the primary objects of my invention is to produce an economical and eiicient bearing which is accurate to dimension and requires no finishing.

Another object of my invention is the provision of an apparatus and method whereby long lengths of lined tubes may be economically produced.

One of the more specific objects of my invention is to produce a lined tube which in the process of forming becomes hardened, burnished and finished to size.

How these and various other objects and advantages can be realized through my invention will appear from my escription hereinafter of the best methods and apparatus for the purpose known to me.

In the drawings, Fig. 1 is a plan view partly in section of an apparatus conveniently embodying my invention, the middle portion being broken out.

Fig. 2 is a partial side view and section of my apparatus, the middle portion being broken out.

Fig. 3 is a view of a tube lined in accordance with my invention, a portion theretion and the lining in elevation and A Fig. 4 is a fragmentary section of th tube in position to enter the inishing'dies.

The apparatus illustrated comprises supports 7 and 8 for the tube or jacket 9 which is to be lined, a trumpet die 10 and a drawing rod 11. At the end of the apparatus Where the skelp 12 of suitable lining metal is to be introduced I provide guiding means 13 mounted on the bracket 14 which guides the skelp at this point.

The drawing rod 11is secured at the end adjacent the trumpet die 10 to the skelp 12 by a slot and pin connection or other suitable means, and extends thru the die, bearings and tube. the drawing head 15 of the drawing mechanism (not shown). It is to be noted that the parts 7, 8, 9, 10, 11, 12 and 15 are serially of being broken out, the tube being in sec- The projecting end is secured to 1924. serial No. 712,982.

arranged and aligned, affording ideal condit1ons for carrying out my method.

The die 10 which I have termed a trumpet dle has a trumpet or funnel shaped mouth 16 merging to a diameter at 17 equal to the inside diameter of the tube 9. To facilitate entrance of the metal strip or skelp 12 which 1s subsequently to become the linlng of the tube, I have `cut the end 18 thereof to a shape corresponding to the shape of the mouth of the die. To further facilitate introduction of the skelp of lining metal the end 18 may have its edges slightly bent or cupped by pliers or the like.

When Athe drawi rod 11 is pulled as by the drawing mechanlsm thru the medium of the head 15, the skelp of linin metal enters the mouth 16 of the die and egins to curl into tubular form so that by the. time it enters the portion 17 of the die it has assumed a tubular form of a diameter to snugly t the -inside of the tube 9. The

drawing member continues to pull the lining metal into the tube until it extends the entire length thereof as shown in Fig. 3. It is to be noted that drawing the tubularly formed lining directly into the pipe as it is formed plays an important part of this invention, in that itis by virtue of this fact that distortion and buckling of the linin is prevented, there having been no wor previously done at the joint or seam. Without thus introducing the lining into the pipe as it is formed the linin would be distorted as there would be nothing to embrace it as it leaves the die.

After the lining has been inserted into the tube, the now lined tube may be considered as a finished product for certain uses. For lined bearings and the like, however, I prefer to close the joint and to cause the lining to adhere securely to the jacket. This may be done by performing work on the inside or outside, preferably both. In the embodiment shown I draw the tube over a die 19 and thru a die 20 (see Fig. 4). The die 19 is of slightly greater diameter than the inside diameter of the lining and the external die 20 is of slightly less diameter than the outside diameter of the tube.

Bearings made by my apparatus and in accordance with my method are very inexpensive as comparedv to bearin made in accordance with existing met ods. Bronzo t' bearings heretofore .used have been cast which means extra allowance for finish, a machiningV operation, increased size to have the required body and the existence of blow holes which occur in casting.

All of these points which materially increase the cost of production are eliminated by my method, particular attention being drawn to the fact that my tubing may be produced in long lengths, is hardened by the heat produced in forming and is burnished and finished to size. Also in passing thru the final dies the liningy is securely fastened to they jacket and the two become in eifectas one.r Further the joint is entirely closed. Sleeves of suitable length are cut olf from the long length formed as described.

I claim:

1. 'lhe method of lining tubes which consists in drawing a skelp vof suitable lining metal thru a die and into the tube to be lined in one operation, said die forming said skelp into a substantially closed tube.

2. The method of lining tubes which consists in drawing a skel of suitable lining metal thru a trumpet die and into the tube to be lined in one operation, said die forming said skelp into a substantiall y closed tube.

3. The method of lining tu es which consists in drawing a skelp of suitable lining metal thru a trumpet die and into the tube to be lined in one operation, said die being adapted to form said skelp into a substantially closed tube andthen in performing work on the inside to further close the joint of the lining. Y

4. The method of lining tubes which consists in drawing a skelp of suitable lining metal thru a trumpet die and into the tube to belined in one operation, said die being adapted to form said skelp'into a substantially closed tube and then in drawing the tube and its lining over a ldie to close the joint.

5. The method of lining tubes which consists in drawing a skel of suitable lining metal thru a trumpet die and into the tube to be lined in one operation, said die bein adapted to form said skelp into a substantie ly closed tube and then in drawing the tube and its lining thru dies performing external and internal work.

6. The method of lining tubes which con-v sists in drawing a skel of suitable lining metal thru a trumpet d1e and into the tube to be lined in one operation, said die being adapted to form said skelp into a substantially closed tube and then in drawing the tube and its lining thru dies performing external and internal work at the same time.

7. The method of linin tubes which consists in forming a strip o lining metal into tubular form by drawing it thru a die and in introducing said tubularly formed lining directly into the tube to be lined as it is being drawn.

8. The method of lining sists in forming a strip or lining metal into tubular form by drawing it thru a die, in introducing said tubularly formed lining directly into the tube to be lined as it is being drawn and then in further closing the joint in the lining.

9. The process of lining a tube which consists in forming a skelp of a lining metal into a tube and in introducing it into the tube as it is being formed.

In testimony whereof, `I have hereunto signed my name.

GEORGE A. SMALL.

tubes which con- 

